Telephone-receiver.



N. TANNAKA. TELEPHONE RECEIVER. .I APPLICATION FILED DEC. I9. 15H6.

Patented J an.` 1, 1918.

fnessas'.-

STATES PATENT OFFICE.

mino rumana, or sos'roxr, iussacnusn'r'rs.

TELEPHONE-ancianas..

1,252,056: 'Pmtii 0f um" nu Patented/Jn. 1, 1918.'

appiimiun nieu December ia, ma. smaila. mais.

Tall wkw'zt'ma concern': Icompanying drawings, forming a 'part of 7 Be it lniown t at I, Narro- TANNAKA, a subject of the Emperor of Japan, residing at Boston, in the county of Sufigolk and State of Massachusetts, have invented certain new and useful Improvements in Telephone-Receivers, of which the following is a full, clear, and exact description.

- This invention relates to improvements in telephone receivers in which a diaphragm is somewhat yieldingly mounted in such manner, that only minute movement is permitted at the peripheral portion4 thereof.

As it is usual ractice, when the diaphragm of .a telep one receiver is directly clamped -between rigid parts, the diaphragm tends to respond' to electrical impulses with the vibration of the inherent cracking sound,/

such as is heard when the circuit connection is made or broken, or. whenstron lulsations are received causing disagrees' 112e or disT torted sound in reproduction. The introduction of soft washers or cushionsat the eri heral portion on oppositeA sides ofthe iap ragm eliminates or; at 'any rate, softens the sound, but the distance between the diahra m and the magnetic pbles, which is to y de icatel adjusted and so maintained to obtain the t result, is subjected to un'due variation or alteratiOm'impairing the sensitiveness of the apparatus, unless the extra dis lacement due to the yielding of the cushions is limited. l have foundthat soft rubber or felt washers, when interposed between the casing and the diaphragm under proper pressure with a small contact'area so that the peripheral vibration of the diahra m is ermitted within a narrow limit, is sii cient y yielding or fiexible to minimize the distortion or, at least to soften the sound, yet maintaining delicate adjustment ofthe ma netic distance.

*Y he essential object 4of inyinvention is to provide apparatus of this'class, in which the diaphragm is faithfully responsive to the electrical impulses in its'cii'cuit, orwith disagreeable harsh or crackin ywhich sound is translatctl` softer than with ,ordinary apparatus, without accompanying sound. y

Vi ith the above and other o jects in vieiw, myinventioncomprises certain detail of construction and arrangement of parts as Vwill be hereinafter more fully described,

illustrated and claimed. I

The invention is best understood from the description taken in connection with the acthis specification, in which- Fi re 1 is'a vertical central section 01's telep one-receiver embodying my invention,

4 and 5 are sectional views of modifications f similarly embodying the invention; Figs.

and4 7, enlarged detail views of parts respectively of Figs. 4 and 5; and Fig. 8 is another modification showing a part of the appa-V ratus.

Similar characters of reference designate similar or corresponding parts throughoutl several views. In the drawings, a receiver barrel A and nn ear piece B screwed therewith constitute a casing or housing. The shoulder C of the ear piece is edged as'shown in 2, or equivalently an edged ring C is secured thereto, and similarly t e open end D of the barrel or cup is ed ed or an edged rin 'D likewise 4mounted t ereon. The ed or sharpened sides of the rin confront a diaphragm E which is cushioned with a circular rubber band or collar F or felt rings, 'as' shown in Figs. 6 and 8, or the like, against the edged rings that hold themv together.

.or cup i' By the screwing the casing, the cushions or washers are placed under proper pressure, so that the desired minute movement of the diaphragm periphery is emitted, the pro r adjustment of the istance, under suc circumstance, between the diaphragm E Vand the poles of magnets G previously having been made. The circumferential edge of thev diaphragm, if exposed, is preferably ke t away from contact with itle basing.

he responsive action to nignetic varia'- tion of-such yieldingly mountV diaphragm! is obviously different from; those ri dly mounted as in ordinary receivers, e. g., unc'- tionally in bending under centrally,4 actin stresses, in that the forme!- takes a form o singular curvature, while the latter curves near the fixed part as well as at the center, and that the former therefore has more free` dom of vibration. i

'In Figs. 4 and .6, the edged rings shown replaced by4 wire rings .of circular section placed in recesses of the casingfA, B, but the section may be of any other form,

such as an angular 'one shown in Fig. a rectilinear one shown 4m Fig.

are

66l sides of the rings being shaped and related D- on oppositel sides of the diaphragm, the

latter thereby being gently'held by the rings.l

In Figs. 5. and 7, a diaphragm E has a rim' portion C D which corresponds to the edged rings C and D of Fig. l in combina tion, and 1s held between the ear piece and barrel of a casing'through cushioning washers F, thus the rings being carried by the diaphragm in form of a rim edged perpendicularly thereto, instead of being attached to the casing.

AThe arrangement in Fig. 8 is the same as Fig. 6, excepting the form of the rings which are thin hands, and considered to be the most convenient form in applying' the' present :invention to ordinary receivers.

The purpose of the employment of the rings being to4 haveproper small area of pressure contact, the rings may take any other Suitable form and shape, when desired. I have found that the structure as above mentioned pern'lits required precise adjustment of the magnetic distance, and is compact enough to maintain it permanently, While it is suiiiciently elastic for the purpose.

From the foregoing description taken 1n connection with the accompanying drawings, the advantage of the .construction and arrangement of parts and the method of operation will 'be readily apparent to those skilled in the art to which this invention appertains, but I wish to 'haveit understood that while I have described and illustrated the apparatus as now thought to be theV best embodiments of my invention, the apparatus herein. shown are merely illustrative, and that therefore, I do not conline myself to any strict conformity to the showing of the drawings, but that suc'h changes and modi ications may be made, when desired, as to fall Within the scope of the. invention as claimed.

Having thus described my invention, what I claim as new is:

1. In ail telephone receiver,- a cell and a diaphragm in cooperative relation with e1ectrical means for translating electrical impulses into sound, stiff rings on opposite sides of the diaphragm, and cushioning` washers disposed in contact with sides of the rings and pressed therewith together b e'- tweenthe cell and the diaphragm, the said to the washers, in such manner that small part of eachwasher is effectually'undr pressure.

2. In a telephoneapparatus, a vibrator mounting, comprising heavin members which terminate with small sur ac a ends on opposite sides of a vibrator,iand a yielding element in contact with the vibrator and held therewith together between the heaving mounting,

members, so that a minor portion of the yielding element is ei'ectually under pressure. l

3. In a telephonie apparatus, the combination wlth magnetic means; of a cell and a diaphragm, one of the said members having parts which are oppositely projecting toward the other member, and cushions dis-- posed over the said projecting parts and. held between'the cell and the diaphragm, so that small parts of cushions are effectually under pressure.

4. In a telephone apparatus, a diaphragm comprising members which have narrow edges on opposite sides of a dia` phragm, cushions disposed in contact with the edges of the said members, and a casing containing all the' above parts together under pressure.

5. In a. telephone receiver, a casing, and a diaphragm, one of said members having projections which terminate with small surface edges on opposite sides of the diaphragm, and a pliable collar or cushion dis posed in contact with the edges of said projections and held between said projections and thev other of said members.

6. In a telephone receiver, the combina t1on with a easing, magnetic means, and a diaphragm; of a. yielding collar over Athe peripheral portion of the diaphragm, and shoulders on opposite sides of the collar n contact therewith, being so shaped and so related to the collar, that small parts of the collar are efectually under pressure.

7. In a telephone receiver, a diaphragm, cushionslin contact with the .peripheral portion thereof,` and a casing having on opposite walls thereof inwardly heaving portions which terminate with small surface edges and hold said diaphragm therebetween through said cushions; in combination with magnetic means.

8. In a sound apparatus, a vibrator mounting, provided wltha cushioning element in contact with the edge part of the vibrator, and shoulders,` disposedon opposite sides ofthe vibrator and having narrow projecting edges, for pressing the vibrator and the cushioning element together.

9. In aftelephonio apparatus, a mounting for the diaphragm thereof, provided with a casing which has projections on opposite -sides of the diaphragm, at least one of the said projections being edged toward the diaphragm, and a yielding element disposed in contact with the edge part of the diaphragm and held therewith together between the said projections.l l

10 In a telephone apparatus, al diaphragtn mounting', i comprising' yielding washerson oppo'sitesides of a diaphragm, and rings pressing and holding said washers and the diaphragm together, and having .small surfacesl at the parts of pressure con- I sides.

12. In a sonorousapparatus, a diaphragm Vmounting comprising a casing which'has circularly narrow edged portions on opposite sides 'of a diaphragm, and cushions or yield- -ing washers held together with the diaphragm between the said edged portions.

13. In a telephone receiver, a casing, a diaphragm in the casing, rings, each having a stiff rim of small surface, .on opposite sides'of the diaphragm, and cushions disposed ln contact with thel said' rims and held with the rings between the casing and the diaphragm, so that a small portion of the mass in each cushion is effectually under pressure.

' 14. In a tion with a casing, magnetic means, and a diaphragm; of rings, each edged toward the other on opposite sides of the diaphragm in the casing, and a cushioning collar or a diaphragm lmounting, 'ders,'at least one of which has a narrow telephone receiver, the combinapad disposed in contact with the peripheral pbrtion of the diaphragm, and held timmwith together between the said rings.

In a sonorous apparatus, a mounting for a diaphragm, comprising a casing, opposing rin'gs having narrow edges with yielding parts at the confronting sides of the f rings for holding the the said yielding parts.

16. In a sonorous apparatus, a vibrator provided with opposing shouldiaphragm between edge proJection, pliable members disposed on opposite sides of a vibrator and pressed therewith together between the shoulders.

17. In a telephonie apparatus, a diaphragm mounting, comprising a casing provided with heaving parts terminating with small top surfaces on opposite sides of a diaphragm, and elastic members held between the diaphragm and the heaving parts, and s0 related to the heaving parts that small part of each oiI the elastic members is effectually under pressure.

In testimony whereof, I aflix-my signature in presence of two subscribing wit-l nesses.

NAH() T ANNAKA.

Witnesses:

J. A. McKay, JOSEPH MoDERMo'rr. 

